I'm pretty new. I just started keeping fish this summer. I completely love it.
I bought this house recently. It has a water softener from like 1975. The bypass is stuck, and I can't turn the water softener off. I've been getting water from the garden hose because it doesn't go through the water softener. Anyway, I noticed my fish weren't looking so great and tested my water; my nitrates were too high. I changed probably 3 gallons in my 20 long. Almost immediately, they were better, so I did another 5 gallon water change, but then they didn't look so good again. The next day, they were great. They were swimming around, investigating things, grouping up (guppies), acting just how they should. I think they were shocked from the temperature. It did drop by a degree or two when I changed that water.
I really want to be able to match temperatures and do a water change whenever I need to, but I have this undesired water softener, and I can't turn it off. Is there anything I can do to my softened water to make it okay to use for water changes?
PS I love my guppies so much.